Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1976-04-12
1977-08-09
Rolinec, Rudolph V.
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330 53, 330207P, 333 17L, H03G 320
Patent
active
040414108
ABSTRACT:
A circuit for detecting the amplitude of a RF signal propagating along a transmission line. A plurality of rectification circuits, each including a diode and a filter capacitor, are located at different positions along the line. The signal electrodes of the capacitors are connected together to thereby non-additively combine the signals seen at each rectifier.
The spacing between the rectifier circuits is carefully selected and will vary with the number of rectifier circuits used. If two rectifiers are employed, the distance therebetween may conveniently be equal to an odd multiple of one-quarter of the wavelength of the driving signal. For this spacing, the combined signal will never fall below the amplitude of the signal produced when the transmission line is terminated with a perfectly matched load. Additionally, the output of the detector will be generally responsive to VSWR. Other RF level detectors having greater numbers of rectifier circuits are also described.
In one embodiment, the detector output is directed to the gain control input of an RF amplifier to provide feedback stabilization thereof. Because the voltage level is sensed on the transmission line, high VSWR will cause a high rectifier output, thus automatically reducing drive to the power amplifier.
REFERENCES:
patent: 3449680 (1969-06-01), Shilb et al.
Dahl Lawrence J.
Harris Corporation
Rolinec Rudolph V.
LandOfFree
RF level detector does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with RF level detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and RF level detector will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1231201